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<div id="main_div" class="container" style="padding-left: 25px; padding-right: 25px">
	<h2> 提交记录 8163 </h2>
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					<th class="col-xs-2"> 用户 </th>
					<th class="col-xs-3"> 题目 </th>
					<th class="col-xs-2"> 状态 </th>
					<th class="col-xs-1"> 得分 </th>
					<th class="col-xs-1"> 用时 </th>
					<th class="col-xs-1"> 内存 </th>
					<th class="col-xs-1"> 语言 </th>
					<th class="col-xs-1"> 代码长度 </th>
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					<td style='font-size:13px'> <a href='/user/profile/YangDavid/index.html'> YangDavid </a> </td>
<td> <a href='/problem/1002/index.html'> 1002. 测测你的多项式乘法 </a> </td>
<td> Accepted </td>
<td> 100 </td>
<td style='font-size:13px'> 677.013 ms </td>
<td style='font-size:13px'> 137 MB + 832 KB </td>
<td style='font-size:13px'> C++11 </td>
<td style='font-size:13px'> 1.91 KB </td>
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					<th class="col-xs-6"> 提交时间 </th>
					<th class="col-xs-6"> 评测时间 </th>
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					<td style='font-size:13px'> 2019-01-30 22:37:41 </td>
<td style='font-size:13px'> 2019-01-30 22:37:45 </td>
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				<label for="code"> 代码 </label>
				<pre style="background-color:white"><code class="cpp">#include&lt;bits/stdc++.h&gt;
#define rep(i, n) for(int i = 1; i &lt;= n; ++i)
using namespace std;
typedef long long ll;

const int FFT_MAXN = 4002000; // multiply by 4!!
const double Pi = 3.1415926535897932384626;
struct comp {
    double re, im;
    comp(double x = 0.0, double y = 0.0): re(x), im(y) { }
    comp operator + (const comp&amp; c) { return comp(re+c.re, im+c.im); }
    comp operator - (const comp&amp; c) { return comp(re-c.re, im-c.im); }
    comp operator * (const comp&amp; c) { return comp(re*c.re-im*c.im, re*c.im+im*c.re); }
    comp operator / (double dev) { return comp(re / dev, im / dev); }
} aa[FFT_MAXN], bb[FFT_MAXN];
int n, m, lim = 1, l = 0, r[FFT_MAXN];
void fft(comp* a, int dft) { // -1 for idft, 1 for dft
    for(int i = 0; i &lt; lim; ++i)
        if(i &lt; r[i]) swap(a[i], a[r[i]]);
    for(int mid = 1; mid &lt; lim; mid &lt;&lt;= 1) {
        comp wn = comp( cos(Pi / mid), sin(Pi / mid) * dft );
        for(int len = mid &lt;&lt; 1, s = 0; s &lt; lim; s += len) {
            comp w(1, 0);
            for(int k = 0; k &lt; mid; ++k, w = w * wn) {
                comp x = a[s + k], y = w * a[s + k + mid];
                a[s + k] = x + y;
                a[s + k + mid] = x - y;
            }
        }
    }
    if(dft == -1) for(int i = 0; i &lt; lim; ++i) a[i] = a[i] / lim;
}
void fft_init(int degA, int degB) {
    lim = 1, l = 0;
    while(lim &lt;= degA + degB) lim &lt;&lt;= 1, l++;
    for(int i = 0; i &lt; lim; ++i)
        r[i] = ( r[i &gt;&gt; 1] &gt;&gt; 1 ) | ( (i &amp; 1) &lt;&lt; (l - 1) );
}

void fft_pmul(comp *A, int degA, comp *B, int degB) { // A will be modified to get answer
    fft_init(degA, degB);
    fft(A, 1);
    fft(B, 1);
    for(int i = 0; i &lt; lim; ++i) A[i] = A[i] * B[i];
    fft(A, -1);
}

void poly_multiply(unsigned *a, int n, unsigned *b, int m, unsigned *c)
{
    for(int i = 0; i &lt;= n; ++i) aa[i].re = a[i];
    for(int i = 0; i &lt;= m; ++i) bb[i].re = b[i];
    fft_pmul(aa, n, bb, m);
    for(int i = 0; i &lt;= n + m; ++i) c[i] = int(aa[i].re + 0.5);
}
</code></pre>
				<br />
				
				<label for="result"> 评测结果 </label><div class="row"><div class="col-xs-12"><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Compilation</b></td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">Compile OK</td><td class="col-xs-2" style="vertical-align:middle">Score: N/A</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_1" aria-expanded="false" aria-controls="detail_1">显示更多</a></td></tr></table></div><div class="collapse" id="detail_1"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>Compiling...
Compile success!
</textarea></div></div><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Testcase #1</b></td><td class="col-xs-2" style="vertical-align:middle">677.013 ms</td><td class="col-xs-2" style="vertical-align:middle">137 MB + 832 KB</td><td class="col-xs-2" style="vertical-align:middle">Accepted</td><td class="col-xs-2" style="vertical-align:middle">Score: 100</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_2" aria-expanded="false" aria-controls="detail_2">显示更多</a></td></tr></table></div><div class="collapse" id="detail_2"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>verdict = Run Finished
time_ms = 677.012929
mem_kb = 141120
Correct Answer
</textarea></div></div></div></div>
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